start adding the ProjectInvite workflow.

services/web/app/coffee/Features/Collaborators/CollaboratorsEmailHandler.coffee

@@ -3,6 +3,7 @@ EmailHandler = require("../Email/EmailHandler")
 Settings = require "settings-sharelatex"
 
 module.exports =
+
 	notifyUserOfProjectShare: (project_id, email, callback)->
 		Project
 			.findOne(_id: project_id )
@@ -22,4 +23,19 @@ module.exports =
 								"rs=ci" # referral source = collaborator invite
 							].join("&")
 					owner: project.owner_ref
-				EmailHandler.sendEmail "projectSharedWithYou", emailOptions, callback
+				EmailHandler.sendEmail "projectSharedWithYou", emailOptions, callback
+
+	notifyUserOfProjectInvite: (project_id, email, invite, callback)->
+		Project
+			.findOne(_id: project_id )
+			.select("name owner_ref")
+			.populate('owner_ref')
+			.exec (err, project)->
+				emailOptions =
+					to: email
+					replyTo: project.owner_ref.email
+					project:
+						name: project.name
+					inviteUrl: "#{Settings.siteUrl}/project/#{project._id}/invite/token/#{invite.token}"
+					owner: project.owner_ref
+				EmailHandler.sendEmail "projectInvite", emailOptions, callback

services/web/app/coffee/Features/Collaborators/CollaboratorsInviteHandler.coffee

@@ -1,5 +1,6 @@
 UserCreator = require('../User/UserCreator')
 Project = require("../../models/Project").Project
+ProjectInvite = require("../../models/ProjectInvite").ProjectInvite
 mimelib = require("mimelib")
 logger = require('logger-sharelatex')
 UserGetter = require "../User/UserGetter"
@@ -8,10 +9,30 @@ CollaboratorsEmailHandler = require "./CollaboratorsEmailHandler"
 Async = require "async"
 PrivilegeLevels = require "../Authorization/PrivilegeLevels"
 Errors = require "../Errors/Errors"
+Crypto = require 'crypto'
 
 module.experts = CollaboratorsInviteHandler =
 
 	inviteToProject: (projectId, sendingUserId, email, privileges, callback=(err,invite)->) ->
+		logger.log {projectId, sendingUserId, email, privileges}, "adding invite"
+		Crypto.randomBytes 24, (err, buffer) ->
+			if err?
+				logger.err {err, projectId, sendingUserId, email}, "error generating random token"
+				return callback(err)
+			token = buffer.toString('hex')
+			invite = new ProjectInvite {
+				email: email
+				token: token
+				sendingUserId: sendingUserId
+				projectId: projectId
+				privileges: privileges
+			}
+			ProjectInvite.save (err) ->
+				if err?
+					logger.err {err, projectId, sendingUserId, email}, "error saving token"
+					return callback(err)
+				CollaboratorsEmailHandler.notifyUserOfProjectInvite projectId, email, invite
+				callback(null, invite)
 
 	revokeInvite: (projectId, inviteId, callback=(err)->) ->
 

services/web/app/coffee/Features/Email/EmailBuilder.coffee

@@ -87,6 +87,26 @@ templates.projectSharedWithYou =
 <p> <a href="<%= siteUrl %>">#{settings.appName}</a></p>
 """
 
+templates.projectInvite =
+	subject: _.template "<%= owner.email %> wants to share <%= project.name %> with you"
+	layout: NotificationEmailLayout
+	type:"notification"
+	compiledTemplate: _.template """
+<p>Hi, <%= owner.email %> wants to share <a href="<%= project.url %>">'<%= project.name %>'</a> with you</p>
+<center>
+	<div style="width:200px;background-color:#a93629;border:1px solid #e24b3b;border-radius:3px;padding:15px; margin:24px;">
+		<div style="padding-right:10px;padding-left:10px">
+			<a href="<%= inviteUrl %>" style="text-decoration:none" target="_blank">
+				<span style= "font-size:16px;font-family:Helvetica,Arial;font-weight:400;color:#fff;white-space:nowrap;display:block; text-align:center">
+					View Invite
+				</span>
+			</a>
+		</div>
+	</div>
+</center>
+<p> Thank you</p>
+<p> <a href="<%= siteUrl %>">#{settings.appName}</a></p>
+"""
 
 templates.completeJoinGroupAccount = 
 	subject: _.template "Verify Email to join <%= group_name %> group"